The important identities are 1) Cos2 A + sin2 A = 1 2) 1 + tan2 A = sec2A for 0°≤A≤90° 3) Cot2 A +1 = cosec2 A for 0°≤A≤90° The major application part of trigonometry can be used for heights and distance for distant objects using the concept of the angle of depression and angle of elevation. Quiz for Trigonometry Your Score: 0 /10
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